US3857326A - Rotary hydraulic machines - Google Patents

Rotary hydraulic machines Download PDF

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Publication number
US3857326A
US3857326A US00281239A US28123972A US3857326A US 3857326 A US3857326 A US 3857326A US 00281239 A US00281239 A US 00281239A US 28123972 A US28123972 A US 28123972A US 3857326 A US3857326 A US 3857326A
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US
United States
Prior art keywords
rotor
cam
housing
cam ring
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00281239A
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English (en)
Inventor
G Blandford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northrop Grumman Properties Ltd
Original Assignee
Lucas Aerospace Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lucas Aerospace Ltd filed Critical Lucas Aerospace Ltd
Application granted granted Critical
Publication of US3857326A publication Critical patent/US3857326A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/10—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary
    • F04B1/107—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders
    • F04B1/1071—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders with rotary cylinder blocks
    • F04B1/1074—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders with rotary cylinder blocks with two or more serially arranged radial piston-cylinder units
    • F04B1/1077—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders with rotary cylinder blocks with two or more serially arranged radial piston-cylinder units located side-by-side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/066—Control by changing the phase relationship between the actuating cam and the distributing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/14—Combinations of two or more pumps the pumps being of different types at least one pump being of the non-positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/125—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts
    • F04B49/126—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts with a double eccenter mechanism

Definitions

  • a rotary hydraulic machine includes a plurality of [51] Int. C1 F04b 13/06 tons shdable 1n rad1a1 bores 1n a rotor which 1s [58] Field of Search 91/475, 492, 483
  • a cam rmg surrounds the rotor and has an internal cam surface engaged by the outer [56] References Clted ends of the pistons.
  • the cam ring is rotatable about an UNITED STATES PATENTS axis which is eccentric with respect both to the axis of 2,392,754 I/ 1946 Mercier 91/497 the internal cam surface and the axis of the rotor.
  • a machine comprises a housing having an inlet and an outlet, a rotor mounted within the housing, a plurality of pistons Slidable in radial bores in the rotor, the said bores successively communicating, in use, with the inlet and the outlet, a cam ring surrounding the rotor and having an internal cam surface engageable by the pistons, the cam ring also having an external surface of revolution which engages a corresponding surface within the housing and the cam ring being rotatable within the housing about the axis of said outer surface which is eccentric with respect both to the axis of the cam surface and the axis of the rotor, and means for rotating the cam ring within the housing.
  • FIG. 1 is alongitudinal section through a pump
  • FIG. 2 is a section on line 2-2 in FIG. 1;
  • FIGS. 3 and 4 show diagrammatically the effects of cam ring movements
  • FIG. 5 shows a graph of precompression pressures in pumps according to the invention.
  • the pump has a housing having an inlet 11 and an outlet 12. Journalled in housing 10 is a rotor 13having a plurality of radial bores 14 (only one of which is shown) arranged in two rows A, B. Slidable in the bores 14 are pistons 15.
  • Inlet 11 opens into the space within the housing 10 surrounding the rotor 13, via a chamber 16 in which is a centrifugal impeller 17 secured to the rotor 13.
  • a chamber 16 in which is a centrifugal impeller 17 secured to the rotor 13.
  • Within the housing 10 are a pair of port plates 18, shown more clearly in FIGS. 3 and 4, having kidney ports 18a with which ports 19 in the rotor 13 successively communicate in use. Kidney port s 18a communicate with the outlet 12.
  • Cam rings 20, 21 Surrounding the rotor 13 are a pair of cam rings 20, 21 respectively associated with the rows A,B, of bores 14.
  • Cam rings 20, 21 have part cylindrical outer surfaces 20a, 21a which engage corresponding surfaces in the housing 10 and whose respective axes 22, 23 are the axes of rotation of the respective cam rings 20, 21. Axes 22, 23 are equispaced on opposite sides of the axis of the rotor 13.
  • Cam ring 21 only is shown in FIG. 2, the relative position of cam ring 20 being indicated.
  • Cam rings 20, 21 have respective inner cam surfaces 24, 25 engaged by the pistons, the respective inner cam surfaces 24, 25, being eccentric with respect to the respective axes 22, 23.
  • the eccentricity of the cam surfaces 24, 25 is equal to the displacement of the axes 22, 23 from the rotor axis. In one angular position of the cam rings 20, 21 i.e. that shown in FIG. 2, the cam surfaces 24, 25 are concentric with the rotor 13.
  • the cam rings 20, 21 are provided with gear teeth 26.
  • the teeth 26 of both rings are engaged by rack teeth 27 on a stem 28 which extends through bore 29 in the housing 10 transtons 30, 31 being such that the cam rings are capable of approximately 50 rotation.
  • the rings '20, 21 are initially set up so that the axes of the cam surfaces 24, 25 are coincident with the rotor axis for a given position of the stem 28.
  • the pump In use, with the surfaces 24, 25 eccentric to the rotor, the pump operates in a known manner to draw liquid in through inlet 11 and to discharge it under pressure through outlet 12.
  • the strokes of the pistons 15 are variable by rotation of the rings 20, 21.
  • FIG. 3 shows the arrangement of port plate 18 and kidney port relative to the axis of the rotor 13 and the axis of rotation 22 of the cam ring 20 when it is required that cam ring 20 shall be rotated in a clockwise direction to increase the stroke of the pump.
  • the axis of cam surface 24 is movable clockwise from a position 40, in which it is coincident with the rotor axis, to a position 41, in which the cam surface 24 has moved to the position indicated at 24a, the top dead centre point 42 on surface 24 moving along line 43.
  • Inward movement of pistons 15 starts at an angular position of rotor 13 corresponding to the location for the time being of point 42.
  • Clockwise movement of cam ring 20 decreases the angle between this rotor position and the rotor position at which ports 19, 18a intercommunicate.
  • FIG. 5 shows curves of the precompression pressure achieveable, plotted against the stroke of the pump for two values of the eccentricity of cam surfaces 24, 25 relative to the respective axes 22, 23. Curve A corresponds to an eccentricity of 0.50 inch and curve B to an eccentricity of 0. l 87 inch.
  • the precompression pressure within bores 14, as ports 19 communicate with port 18a thus remains substantially constant over these parts of the pump stroke variation.
  • FIG. 4 shows an arrangement in which the cam ring 20 is rotated anticlockwise to increase pump stroke, the rotor 13 moving clockwise, as before.
  • an increase in pump stroke results in an increase in the angle between top dead centre and the position at which ports 18a, 19 intercommunicate.
  • a rotary hydraulic machine comprising a housing having an inlet and an outlet, a rotor mounted within the housing, a plurality of pistons slidable in radial bores in the rotor, thesaid bores successively communicating, in use, with the inlet and the outlet, a port plate fixed in the housing and engaged by the rotor to act as a valve to control communication between said bores in the rotor and the inlet and outlet, said rotor including ports communicating respectively with the bores and opening onto a face of the rotor which is engaged by said port plate, said port plate having a kidney-shaped port spaced from the edge of the port plate in the path of movement of the rotor ports thereover, by a distance greater than the width of each of said rotor ports, and a cam ring surrounding the rotor and having an internal cam surface engageable by the pistons, the cam ring also having an external surface of revolution which engages a corresponding surface within the housing, and the cam ring being rotatable within the housing about the
  • a rotary hydraulic machine as claimed in claim 1 in which said means for rotating the cam ring comprises teeth on said external surface of the cam ring and a toothed gear element engaged with said teeth and movable relative to the housing.
  • a rotary hydraulic machine as claimed in claim 2 in which said tooth gear element comprises a rack longitudinally movable in a bore in the body.
  • a rotary hydraulic machine as claimed in claim 2 in which said toothed element is a rack which extends in a direction parallel to said common plane but perpendicular to said axis and engages the teeth on both cam rings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Hydraulic Motors (AREA)
US00281239A 1971-08-17 1972-08-16 Rotary hydraulic machines Expired - Lifetime US3857326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3846971A GB1398527A (en) 1971-08-17 1971-08-17 Rotary hydraulic piston pumps

Publications (1)

Publication Number Publication Date
US3857326A true US3857326A (en) 1974-12-31

Family

ID=10403654

Family Applications (1)

Application Number Title Priority Date Filing Date
US00281239A Expired - Lifetime US3857326A (en) 1971-08-17 1972-08-16 Rotary hydraulic machines

Country Status (6)

Country Link
US (1) US3857326A (fr)
JP (1) JPS5131683B2 (fr)
DE (1) DE2240113A1 (fr)
FR (1) FR2231248A5 (fr)
GB (1) GB1398527A (fr)
IT (1) IT962121B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983700A (en) * 1974-12-20 1976-10-05 Barrett George M Fluid transmission
US4286503A (en) * 1977-03-24 1981-09-01 Stefan Fule Machine of the axial piston pump type which can be used as a pump or as a motor
US9932827B2 (en) 2012-07-11 2018-04-03 Eaton Intelligent Power Limited Hydraulic radial piston devices

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR51532E (fr) * 1941-04-30 1942-10-05 Audi Ag Pompe d'injection pour combustibles ou autres liquides
US2392754A (en) * 1941-03-13 1946-01-08 Mercier Jean Pump
US2458985A (en) * 1945-08-08 1949-01-11 Oilgear Co Hydrodynamic machine
US2749844A (en) * 1951-11-01 1956-06-12 Bendix Aviat Corp Pump
US2847938A (en) * 1955-12-01 1958-08-19 John T Gondek Hydraulic pump
US3122104A (en) * 1961-12-28 1964-02-25 Bendix Corp Balance ring for pulsating fluid machinery
US3190232A (en) * 1963-02-11 1965-06-22 Budzich Tadeusz Hydraulic apparatus
US3518919A (en) * 1969-03-24 1970-07-07 Lucas Industries Ltd Radial piston pumps
US3626810A (en) * 1969-01-21 1971-12-14 Silent Hydropower Inc Variable reversible piston pump
US3641881A (en) * 1970-02-06 1972-02-15 Ec Corp Drive mechanism
US3657971A (en) * 1970-04-21 1972-04-25 Lucas Industries Ltd Radial piston pumps or motors

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392754A (en) * 1941-03-13 1946-01-08 Mercier Jean Pump
FR51532E (fr) * 1941-04-30 1942-10-05 Audi Ag Pompe d'injection pour combustibles ou autres liquides
US2458985A (en) * 1945-08-08 1949-01-11 Oilgear Co Hydrodynamic machine
US2749844A (en) * 1951-11-01 1956-06-12 Bendix Aviat Corp Pump
US2847938A (en) * 1955-12-01 1958-08-19 John T Gondek Hydraulic pump
US3122104A (en) * 1961-12-28 1964-02-25 Bendix Corp Balance ring for pulsating fluid machinery
US3190232A (en) * 1963-02-11 1965-06-22 Budzich Tadeusz Hydraulic apparatus
US3626810A (en) * 1969-01-21 1971-12-14 Silent Hydropower Inc Variable reversible piston pump
US3518919A (en) * 1969-03-24 1970-07-07 Lucas Industries Ltd Radial piston pumps
US3641881A (en) * 1970-02-06 1972-02-15 Ec Corp Drive mechanism
US3657971A (en) * 1970-04-21 1972-04-25 Lucas Industries Ltd Radial piston pumps or motors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983700A (en) * 1974-12-20 1976-10-05 Barrett George M Fluid transmission
US4286503A (en) * 1977-03-24 1981-09-01 Stefan Fule Machine of the axial piston pump type which can be used as a pump or as a motor
US9932827B2 (en) 2012-07-11 2018-04-03 Eaton Intelligent Power Limited Hydraulic radial piston devices

Also Published As

Publication number Publication date
IT962121B (it) 1973-12-20
DE2240113A1 (de) 1973-02-22
FR2231248A5 (fr) 1974-12-20
JPS5131683B2 (fr) 1976-09-08
GB1398527A (en) 1975-06-25
JPS4829002A (fr) 1973-04-17

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